Search Publications
Hubble Space Telescope Observations of Sub-damped Lyα Absorbers at z < 0.5, and Implications for Galaxy Chemical Evolution
York, Donald G.; Kulkarni, Varsha P.; Lauroesch, James T. +5 more
We report observations of four sub-damped Lyα (sub-DLA) quasar absorbers at z\lt 0.5 obtained with the Hubble Space Telescope Cosmic Origins Spectrograph. We measure the available neutrals or ions of C, N, O, Si, P, S, Ar, Mn, Fe, and/or Ni. Our data have doubled the sub-DLA metallicity samples at z\lt 0.5 and improved constraints on sub-DLA chemi…
Searching for correlations in simultaneous X-ray and UV emission in the narrow-line Seyfert 1 galaxy 1H 0707-495
Fabian, A. C.; Gallo, L. C.; Zoghbi, A. +1 more
We examine simultaneous X-ray and UV light curves from multi-epoch 8 d XMM-Newton observations of the narrow line Seyfert 1 galaxy 1H 0707-495. The simultaneous observations reveal that both X-ray and UV emission are variable and that the amplitude of the X-ray variations is significantly greater than that of the UV variations in both epochs. Usin…
Physical properties of z > 4 submillimeter galaxies in the COSMOS field
Bondi, M.; Finoguenov, A.; Magnelli, B. +31 more
We investigate the physical properties of a sample of six submillimeter galaxies (SMGs) in the COSMOS field, spectroscopically confirmed to lie at redshifts z> 4. While the redshifts for four of these SMGs were previously known, we present here two newly discovered zspec> 4 SMGs. For our analysis we employ the rich (X-ray to radio…
On the significance of power asymmetries in Planck CMB data at all scales
Notari, Alessio; Quartin, Miguel
We perform an analysis of the CMB temperature data taken by the Planck satellite investigating if there is any significant deviation from cosmological isotropy. We look for differences in the spectrum between two opposite hemispheres and also for dipolar modulations. We propose a new way to avoid biases due to partial-sky coverage by producing a m…
Exploring massive neutrinos in dark cosmologies with eftcamb/EFTCosmoMC
Frusciante, Noemi; Hu, Bin; Raveri, Marco +1 more
We revisit the degeneracy between massive neutrinos and generalized theories of gravity in the framework of the effective field theory of cosmic acceleration. In particular, we consider f (R ) theories and a class of nonminimally coupled models parametrized via a coupling to gravity which is linear in the scale factor. In the former case, we find …
Curtain eruptions from Enceladus' south-polar terrain
Spitale, Joseph N.; Hurford, Terry A.; Rhoden, Alyssa R. +2 more
Observations of the south pole of the Saturnian moon Enceladus revealed large rifts in the south-polar terrain, informally called `tiger stripes', named Alexandria, Baghdad, Cairo and Damascus Sulci. These fractures have been shown to be the sources of the observed jets of water vapour and icy particles and to exhibit higher temperatures than the …
Faraday Tomography of the North Polar Spur: Constraints on the Distance to the Spur and on the Magnetic Field of the Galaxy
Leahy, J. P.; Gaensler, B. M.; McClure-Griffiths, N. M. +9 more
We present radio continuum and polarization images of the North Polar Spur (NPS) from the Global Magneto-ionic Medium Survey conducted with the Dominion Radio Astrophysical Observatory 26 m Telescope. We fit polarization angle versus wavelength squared over 2048 frequency channels from 1280 to 1750 MHz to obtain a Faraday rotation measure (RM) map…
A Measurement of the Black Hole Mass in NGC 1097 Using ALMA
Kohno, K.; Onishi, K.; Iguchi, S. +1 more
We present an estimate of the mass of the supermassive black hole (SMBH) in the nearby type-1 Seyfert galaxy NGC 1097 using Atacamma Large Millimeter/submillimeter Array (ALMA) observations of dense gas kinematics. Dense molecular gas dynamics are traced with HCN(J=1-0) and HC{{O}+}(J=1-0) emission lines. Assuming a host galaxy inclinat…
The JCMT Plane Survey: early results from the ℓ = 30° field
Martin, P. G.; Hill, T.; White, G. J. +55 more
We present early results from the JCMT (James Clerk Maxwell Telescope) Plane Survey (JPS), which has surveyed the northern inner Galactic plane between longitudes ℓ = 7° and ℓ = 63° in the 850-µm continuum with SCUBA-2 (Submm Common-User Bolometer Array 2), as part of the JCMT Legacy Survey programme. Data from the ℓ = 30° survey region, whi…
Cosmological constraints on deviations from Lorentz invariance in gravity and dark matter
Lesgourgues, J.; Audren, B.; Blas, D. +2 more
We consider a scenario where local Lorentz invariance is violated by the existence of a preferred time direction at every space-time point. This scenario can arise in the context of quantum gravity and its description at low energies contains a unit time-like vector field which parameterizes the preferred direction. The particle physics tests of L…